Machine eor sawing stone



UNITED srATns PATENT carica.

A. M. BURNHAM, OF MONTPELIER, VERMONT.

MACHINE FOR SAWING STONE.

Specicaton of Letters latent No. 29,667, dated August 21, 1860.

T0 all 'whom it may concern:

Be it known that I, A. M. BURNHAM, of Montpelier, in the county of IVashington and State of Vermont, have invented a new and Improved Sawing-Machine for Sawing Stone or Marble into Blocks of Polygonal Taper Form; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specication, in which- Figure 1, is a side sectional view of my invention taken in the line as, Fig. 2. Fig. 2, a horizontal section of the same taken in the line as, Fig. 1.

Similar letters of reference indicate corresponding parts in the two figures.

This invention consists in the peculiar arrangement of means employed for giving the saws a lateral vibrating movement while working in the usual reciprocating manner to produce the cuts, the lateral movement of the saws admitting of their oblique position relatively with each other and enabling them to cut simultaneously the two opposite sides of a polygonal taper block.

This invention like many others of the same class is more especially designed for sawing blocks for tombstones, fence posts and the like.

To enable those skilled in the art to fully understand and construct my invention I will proceed to describe it.

A, represents a suitable base or platform on which an upright rectangular frame B is placed. From each corner of this frame B, a cord or chain a, is suspended and these chains support a saw-frame C, which is allowed to work freely back and forth in the lower part of the frame B.

Vithin the saw frame C, the saws D, are placed, four saws are represented in Fig. 2, but more or lessv may be used as desired. The saws shown in the drawings are arranged in pairs the saws in each pair having an oblique position relatively with each other as shown clearly in Fig. 2.

The ends of the saws of each pair are attached to the ends of levers or small rock bars b which are secured by fulcrum pins c, at the ends of arms d, attached to the traverse bars e, e', at the ends of the saw frame. The levers or rock bars b, in the traverse bar e', have each an arm f, attached to them, and the outer ends of these arms are connected by a bar g. The saws D, are so attached to the levers or rock bars that a connection is preserved between them throughout, the central lever or rock bar b', in the traverse bar e, connecting the inner saws of each pair as seen in Fig. 2.

The central lever or rock bar b, has a bent lever E, attached to its fulcrum pin, said pin also serving as the fulcrum pin of lever E. The short arm of vlever E, is attached to the bar g, which connects the ends of the arms f, of the levers or rock bars b', and the longer arm of said lever E, is attached to one end of a bar F, the opposite end of which is connected by a joint k, to the frame B.

Gr, is the driving shaft which is placed in the frame B, above the saws and has a crank H, at its inner end, said crank being connected by a pitman I, with the saw frame C.

The operation is as follows: The marble or stone block to be sawed, shown in blue outline, is placed on the base or platform A, beneath the saws D, and the shaft G, is rotated by any convenient power, the crank and pitman H, I, communicating a reciprocating movement to the suspended saw frame. Simultaneously with the lateral vibratory movement of the frame C, a lateral vibratory movement is given the saws D, through the medium of the movement of the saw frame in connection with therock bars Z), b', lever E, and bar F. This lateral vibratory movement of the saws' compensates for their oblique position, and permits them to saw obliquely with the sides of the saw frame. lVhen the block has been cut through, the several pieces are inverted and the remaining two sides of each piece cut in taper form as before. When two pairs of saws are used it will be seen that three pieces are sawed simultaneously from the block. The saw frame C, may be fed down as the saws cut by the ordinary or any proper means, and if desired the ordinary rigid saws may be placed in the saw frame C, and used in connection with the saws D, so that cuts oblique and parallel with the saw frame may be made at the same time.

I am aware that sawing machines have been devised for sawing marble blocks in taper polygonal form the saws having a lateral vibratory movement, in connection with the longitudinal reciprocating one, and

I do not claim broadly such device irrespective of the particular means employed for and with saws D, and frame B, the Whole giving the saws the lateral vibratory moveconstructed and operating as herein shown ii ment. and described for the purpose set forth.

I claim therefore as new and desire to Se- A. M. BURNHAM. 5 eure by Letters Patent- Witnesses:

The arrangement of the bar g, arms f, J. T. THURSTON, rock bars b, b', bent lever E, the frame C, CHARLES DEWEY. 

